Applications to Real Measured Data - Introduction to Imaging from Scattered Fields - page 118

Receiver
(far field)

Transmitter
(far field)

α

ϕ s

ϕ i

Object

Figure 9.1 Ipswich scattering experiment where α is the angle of incidence, φ s is the scattering angle, and
φ i the illuminating direction.

resulting reconstruction of the object, V . The IPS008 target is considered a
strong scattering object since k | V | a ≈ 87 where k , the wave number, is cal-
culated as k = 2π/λ = 2π/0.03 = 209.5, V is the scattering strength or average
permittivity and a is the dimension of the largest feature of object. IPS008
has proved to be a challenging object to image for all of the inverse scattering

(a) Wall thickness 0.2 cm (b)

4

230
220
210
200
190
180
170
160
150
140
130

3
2
1
0
-1
-2
-3
-4
-4

Sand
ε r = 2.6

5 λ

Salt
ε r = 2.9

2.5 λ

-3 -2 -1 01234

λ

(c)

4

3
2.8
2.6

3
2
1
0
-1
-2
-3
-4 -4

2.4
2.2
2
1.8

-3 -2 -1 01234

λ

Figure 9.2 IPS008 target configuration: (a) Target object IPS008 geometry, (b) Born reconstruction, (c) ceps-
tral reconstruction, and (d) geometrical comparison between reconstructed object and original object.